Double covered lycra soft yarn

ABSTRACT

This invention relates to the Lycra Soft yarn double covered with nylon to prevent twisting and to maintain elasticity. 
     The double covered Lycra Soft yarn of this invention is characterized by being polyurethane based and double covered with heat treated nylon high speed textured yarn, in order to prevent twisting and to maintain elasticity after processing. 
     According to the art of this invention, the Lycra Soft yarn can maintain elasticity and be protected from twist.

TECHNICAL FIELD

This invention relates to the yarn for knitting socks, especially, thepolyurethane based Lycra Soft 520 denier for the prevention of twist andmaintenance of elasticity after processing.

By double covering the polyurethane based Lycra Soft 520 denier yarnwith nylon 70D/24F/1 high speed textured, applying S twist and Z twistat the same time to prevent twisting, maintain the elongation rate ofthe Lycra Soft 520 denier yarn at proper value while utilizing themaximum restitution.

When the said nylon 70D/24F/1 high speed textured yarn (20, 30) is woundfirst in S twist (842.8 TPM) and second in Z twist(1960.8 TPM ), theLycra Soft 520 denier yarn, which is the core yarn, gives the elongationrate (tensile elongation 440.9%, permanent elongation 7.2%, restitutionrate 98.2%) which is lower than the original value.

BACKGROUND ART

To produce polyurethane based Lycra Soft 520 denier yarn double coveredwith nylon.

DISCLOSURE [Technical Problem]

Generally speaking, core yarn used for producing socks has been usedwith special yarn feeding devices which incorporate anti-slip device forpolyurethane yarn, without any specific processing, due to the highelasticity.

The socks produced in this method present the characteristics of theLycra Soft 520 denier yarn which has a stronger restitution andelongation than common yarn.

However, sometimes it is necessary for the socks made with Lycra Soft520 denier yarn to be restricted in its elongation rate, especially forleisure-sports activity socks, which has not been possible inconventional ways.

In addition, due to the structural characteristics of the elastic threadfeeding device of common sock knitting machines, it is difficult todesign knitting with Lycra Soft yarn which is liable to slip at feeding.

The technical goal of this invention is to produce polyurethane basedLycra Soft yarn double covered with nylon, for the prevention oftwisting and maintenance of elasticity after processing.

[Technical Solution]

In this invention, it is possible to replace the said nylon high speedtextured yarn with any one of polyamide, polyester, or polypropylenefiber which are filament yarn or long staple, or with a long staplecopolymer yarn.

As described hereinabove, by double covering the polyurethane basedLycra Soft 520 denier yarn with nylon 70D/24F/1 high speed textured,applying S twist and Z twist at the same time to prevent twisting,maintain the elongation rate of the Lycra Soft 520 denier yarn at propervalue while utilizing the maximum restitution.

When the said nylon 70D/24F/1 high speed textured yarn (20, 30) is woundfirst in S twist (842.8 TPM) and second in Z twist (1960.8 TPM ), theLycra Soft 520 denier yarn, which is the core yarn, gives the elongationrate (tensile elongation 440.9%, permanent elongation 7.2%, restitutionrate 98.2%) which is lower than the original value.

In order to accomplish the strength of sock parts in accordance with theshape of leg using Lycra Soft 520 denier yarn, processed by thisinvention, the feeding speed of the yarn into knitting machine with thedouble covered yarn roller, which is provided in most machines, and thestepping motor.

Finished socks, as well as similar products, are heat treated(approximately for 40-50 minutes at 90-100° C.) after dyeing in order togive high elasticity to the Lycra Soft 520 denier yarn double covered inaccordance with this invention, and to strengthen the compressionproperty of the product by contracting the nylon 70D/24F/1 high speedtextured yarn.

In addition, the surface of the nylon 70D/24F/1 high speed textured yarncovering the Lycra Soft 520 denier yarn becomes smoother by the heatcontraction, giving better wearing sense and the structural stability ofthe product, providing the elasticity and compression better than acompress.

As for the knitting method, the core yarn produced by the art of thisinvention is not only used in a Specific part of socks but used in allthe part of socks except the toe and heel. The partial compressionaccording to the shape of leg is controlled with the double covered yarnroller and the stepping motor which are installed at most sock knittingmachines.

By implementing high elastic multi-stage compressive knittingtechnology, blood in foot is pressed upward promoting circulation aswell as protection of ankles, preventing and absorbing sweat, andenhancing durability.

The fruit of this invention can be maximized by incorporating propermanagement of production processes including knitting and after processtreatments.

[Advantageous Effects]

By this invention, the Lycra Soft yarn double covered with nylon highspeed textured yarn can be protected from twisting and maintain highelasticity, therefore, the socks knitted with said yarn provide theelasticity better than a compress, soft restitution, soft wearing sense,and comfort.

DESCRIPTION OF DRAWINGS

FIG. 1 illustrates the Lycra Soft 520 denier yarn double covered by theart of this invention.

NUMBERS AND SYMBOLS OF THE DRAWINGS

10 . . . Lycra Soft Yarn

20,30 . . . Nylon 70D/24F/1 High Speed Textured Yarn

[Best Mode]

The most desirable shape of the embodiment of this invention is theLycra Soft 520 denier yarn, covered first by S twist and second by Ztwist with nylon 70D/24F/1 high speed textureded yarn.

[Mode for Invention]

The double covered Lycra Soft yarn of this invention is characterized bythe polyurethane based Lycra Soft 520 denier yarn double covered withnylon high speed textured yarn, to prevent twisting and maintainelasticity after processing.

And, the said nylon high speed textured yarn is characterized by nylon70D/24F/1 high speed textured yarn.

And, the said nylon high speed textured is characterized by beingreplaced with any one of filament yarn, polyamide yarn, polyester yarn,or polypropylene yarn.

And, the said double covering is characterized by first and secondcovering by S twist.

And, the said double covering is characterized by S twist first and thenZ twist second.

And, the said double covering is characterized by Z twist first and thenS twist second.

And, the said double covering is characterized by first and secondcovering by Z twist.

Herein below, the invention is described in detail refereeing to thedrawings;

FIG. 1 illustrates an embodiment of a core yarn double covered withnylon, comprising the core yarn (10) and nylon high speed textured yarn(20, 30).

A core yarn (10) is the material of fabric, which is the polyurethanebased Lycra Soft 520 denier yarn in this invention.

Nylon high speed textured yarn (20, 30) has superior elasticity andcontraction by heat treatment, which is the nylon 70D/24F/1 high speedtextured yarn in this invention.

FIG. 1 illustrates the Lycra Soft 520 denier yarn (10) double coveredwith nylon 70D/24F/1 high speed textured yarn (20, 30) by S twist or Ztwist, to prevent twisting and to maintain elasticity after processing.

The said double covering may be carried out in such a manner that Stwist covering first then Z twist covering next, or in reverse.

Or, said double covering may be comprised of S twist or Z twist only forboth first and second covering.

In this invention, the said nylon high speed textured yarn may bereplaced with filament yarn, or any one of polyamide, poly ester,polypropylene which is long staple, or with long staple copolymer yarn.

As described hereinabove, by double covering the polyurethane basedLycra Soft 520 denier yarn with nylon 70D/24F/1 high speed textured yarn(20, 30), applying S twist and Z twist at the same time to preventtwisting, maintain the elongation rate of the Lycra Soft 520 denier yarnat proper value while utilizing the maximum restitution.

When the said nylon 70D/24F/1 high speed textured yarn (20, 30) is woundfirst in S twist (842.8 TPM) and second in Z twist (1960.8 TPM ), theLycra Soft 520 denier yarn, which is the core yarn, gives the elongationrate (tensile elongation 440.9%, permanent elongation 7.2%, restitutionrate 98.2%) which is lower than the original value.

In order to accomplish the strength of sock parts in accordance with theshape of leg using Lycra Soft 520 denier yarn, processed by thisinvention, the feeding speed of the yarn into knitting machine with thedouble covered yarn roller, which is provided in most machines, and thestepping motor.

Finished socks, as well as similar products, are heat treated(approximately for 40-50 minutes at 90-100° C.) after dyeing in order togive high elasticity to the Lycra Soft 520 denier yarn double covered inaccordance with this invention, and to strengthen the compressionproperty of the product by contracting the nylon 70D/24F/1 high speedtextured yarn.

In addition, the surface of the nylon 70D/24F/1 high speed textured yarncovering the Lycra Soft 520 denier yarn becomes smoother by the heatcontraction, giving better wearing sense and the structural stability ofthe product, providing the elasticity and compression better than acompress.

As for the knitting method, the core yarn produced by the art of thisinvention is not only used in a specific part of socks but used in allthe part of socks except the toe and heel. The partial compressionaccording to the shape of leg is controlled with the double covered yarnroller and the stepping motor which are installed at most sock knittingmachines. By implementing high elastic multi-stage compressive knittingtechnology, blood in foot is pressed upward promoting circulation s wellas protection of ankles, preventing and absorbing sweat, and enhancingdurability.

As set forth hereinabove, this invention has been described referring tothe embodiments illustrated in the drawings, however, such descriptionsare only exemplary and explanatory, and it is obvious that anyone whohas common knowledge in the field of art of this invention will be ableto modify, change, or add in a wide variety not departing from thespirit and the scope of this invention as set forth in the appendedclaims, therefore, such modifications, changes, or additions should beconsidered to be covered by and included in the claims of thisinvention.

INDUSTRIAL APPLICABILITY

In Order to accomplish the strength of sock parts in accordance with theshape of leg using Lycra Soft 520 denier yarn, processed by thisinvention, the feeding speed of the yarn into knitting machine with thedouble covered yarn roller, which is provided in most machines, and thestepping motor.

Finished socks, as well as similar products, are heat treated(approximately for 40-50 minutes at 90-100° C.) after dyeing in order togive high elasticity to the Lycra Soft 520 denier yarn double covered inaccordance with this invention, and to strengthen the compressionproperty of the product by contracting the nylon 70D/24F/1 high speedtextured yarn.

In addition, the surface of the nylon 70D/24F/1 high speed textured yarncovering the Lycra Soft 520 denier yarn becomes smoother by the heatcontraction, giving better wearing sense and the structural stability ofthe product, providing the elasticity and compression better than acompress.

As for the knitting method, the core yarn produced by the art of thisinvention is not only used in a specific part of socks but used in allthe part of socks except the toe and heel. The partial compressionaccording to the shape of leg is controlled with the double covered yarnroller and the stepping motor which are installed at most sock knittingmachines. By implementing high elastic multi-stage compressive knittingtechnology, blood in foot is pressed upward promoting circulation s wellas protection of ankles, preventing and absorbing sweat, and enhancingdurability.

1. The lycra soft yarn, wherein the said lycra soft yarn is apolyurethane based Lycra Soft 520 denier yarn double covered with nylonhigh speed textured yarn in order to prevent twisting and to maintainelasticity after processing.
 2. The Lycra Soft yarn double covered withnylon yarn of claim 1, wherein the said nylon yarn is nylon 70D/24F/1high speed textured yarn.
 3. The Lycra Soft yarn double covered withnylon yarn of claim 1, wherein the said nylon high speed textured yarncan be replaced with any one among the filament yarn, polyamide yarn,polyester yarn, or polypropylene yarn.
 4. The double covered Lycra Softyarn of claim 1, wherein the double covering is carried out by S twistfor the first and the second covering.
 5. The double covered Lycra Softyarn of claim 1, wherein the double covering is carried out by S twistfor the first covering and by Z twist by the second covering.
 6. Thedouble covered Lycra Soft yarn of claim 1, wherein the double coveringis carried out by Z twist for the first covering and by S twist by thesecond covering.
 7. The double covered Lycra Soft yarn of claim 1,wherein the double covering is carried out by Z twist for the first andthe second covering.